Griffin Technology RoadTrip FM Transmitter & Auto Charger and Cradle for iPod Convenient one-piece transmitter and charger module uses any frequency from 87.7 to 107.9 Backlit screen shows which frequency RoadTrip is currently broadcasting Transmitter can be removed and used with a Mac or PC computer Plugs into any auto power outlet or lighter adapter Compatibility: All Dock connector iPods including iPod nano (1G only), iPod mini, 3G iPod, 4G iPod with click wheel, iPod Color, iPod Video